This 1968 Mullard circuit detects fire by smoke using LDR-type sensors. The circuit makes use of transistors of the time that admit equivalents.
The values of the components in this experimental circuit are those of the previous circuit. The...
The experimental musical instrument with the LM3909 is suggested by National Semiconductor in...
With the values of the components indicated, the circuit generates a 1 kHz signal. The power...